Linux Community
For Qt5, the 'ibus' USE flag enables the ibus input system. For Qt4, install app-i18n/ibus-qt instead.
https://packages.gentoo.org/packages/dev-qt/qtgui
https://packages.gentoo.org/categories/dev-qt
I have configured ibus-chewing and it works in firefox, konqueror, but not in konqueror, kate